diff --git a/common/answer.ts b/common/answer.ts
index 87e7d05f..9dcc3828 100644
--- a/common/answer.ts
+++ b/common/answer.ts
@@ -9,7 +9,7 @@ export type Answer = {
   userId: string
   username: string
   name: string
-  avatarUrl: string
+  avatarUrl?: string
 
   text: string
 }
diff --git a/common/comment.ts b/common/comment.ts
index 95c2ec4a..15cfbcb5 100644
--- a/common/comment.ts
+++ b/common/comment.ts
@@ -13,5 +13,5 @@ export type Comment = {
   // Denormalized, for rendering comments
   userName: string
   userUsername: string
-  userAvatarUrl: string
+  userAvatarUrl?: string
 }
diff --git a/common/contract.ts b/common/contract.ts
index ee3034de..82a330b5 100644
--- a/common/contract.ts
+++ b/common/contract.ts
@@ -11,7 +11,7 @@ export type FullContract<
   creatorId: string
   creatorName: string
   creatorUsername: string
-  creatorAvatarUrl: string
+  creatorAvatarUrl?: string // Start requiring after 2022-03-01
 
   question: string
   description: string // More info about what the contract is about
diff --git a/common/user.ts b/common/user.ts
index ce586774..8f8e6d0d 100644
--- a/common/user.ts
+++ b/common/user.ts
@@ -4,7 +4,7 @@ export type User = {
 
   name: string
   username: string
-  avatarUrl: string
+  avatarUrl?: string
 
   // For their user page
   bio?: string
diff --git a/web/components/SEO.tsx b/web/components/SEO.tsx
index 8420b199..8987d671 100644
--- a/web/components/SEO.tsx
+++ b/web/components/SEO.tsx
@@ -6,7 +6,7 @@ export type OgCardProps = {
   metadata: string
   creatorName: string
   creatorUsername: string
-  creatorAvatarUrl: string
+  creatorAvatarUrl?: string
 }
 
 function buildCardUrl(props: OgCardProps) {
@@ -14,6 +14,11 @@ function buildCardUrl(props: OgCardProps) {
     props.probability === undefined
       ? ''
       : `&probability=${encodeURIComponent(props.probability ?? '')}`
+  const creatorAvatarUrlParam =
+    props.creatorAvatarUrl === undefined
+      ? ''
+      : `&creatorAvatarUrl=${encodeURIComponent(props.creatorAvatarUrl ?? '')}`
+
   // URL encode each of the props, then add them as query params
   return (
     `https://manifold-og-image.vercel.app/m.png` +
@@ -21,7 +26,7 @@ function buildCardUrl(props: OgCardProps) {
     probabilityParam +
     `&metadata=${encodeURIComponent(props.metadata)}` +
     `&creatorName=${encodeURIComponent(props.creatorName)}` +
-    `&creatorAvatarUrl=${encodeURIComponent(props.creatorAvatarUrl)}` +
+    creatorAvatarUrlParam +
     `&creatorUsername=${encodeURIComponent(props.creatorUsername)}`
   )
 }
diff --git a/web/pages/api/v0/_types.ts b/web/pages/api/v0/_types.ts
index 4569576c..8f2976fa 100644
--- a/web/pages/api/v0/_types.ts
+++ b/web/pages/api/v0/_types.ts
@@ -12,7 +12,7 @@ export type LiteMarket = {
   creatorUsername: string
   creatorName: string
   createdTime: number
-  creatorAvatarUrl: string
+  creatorAvatarUrl?: string
 
   // Market attributes. All times are in milliseconds since epoch
   closeTime?: number